Need suggestions for trek near Delhi

I'm planning a trek with my friends around Dec/Jan with medium to hard difficulty and duration of 2-4 days. Do you folks have any good suggestions.? Majorly I'm looking in the northern side of India but if you have very great suggestion ...

Hi ! Need some suggestions from fellow 🍇 viners about some solo trip ideas near Delhi !!!

I am planning to go for a Trek near Bangalore this month, any suggestions for a good trek and a place to book the trek?

Planning for 2D trek

Could anybody please suggest trekking near Bangalore in a budget?